Digital added main line system

In a system for transmission of a single analog signal from a telephone company location to a subscriber location over a twisted pair, a method of converting said system to a system for multiple signal transmission over said twisted pair comprising:

• a) installing master equipment at said telephone company location, said master equipment:
• i) inputting multiple incoming telephone company analog signals from said telephone company equipment and outputting multiple outgoing telephone company analog signals to said telephone company equipment;
• ii) converting said multiple incoming telephone company analog signals to an outgoing telephone company higher-rate multiplexed binary signal and converting an incoming telephone company higher-rate multiplexed binary signal to said multiple outgoing telephone company analog signals;
• and
• iii) converting said outgoing telephone company higher-rate multiplexed binary signal to a multiplexed outgoing 2B1Q signal and converting a multiplexed incoming 2B1Q signal to said incoming telephone company higher-rate multiplexed binary signal;
• and
• iv) transmitting said multiplexed outgoing 2B1Q signal over said twisted pair to said subscriber location and receiving said multiplexed incoming 2B1Q signal;
• and
• b) installing a remote terminal at said subscriber location, said remote terminal:
• i) inputting said multiplexed outgoing 2B1Q signal from said twisted pair and outputting said multiplexed incoming 2B1Q signal on said twisted pair;
• ii) converting said multiplexed outgoing 2B1Q signal to an outgoing subscriber higher-rate multiplexed binary signal and converting an incoming subscriber higher-rate multiplexed binary signal to said multiplexed incoming 2B1Q signal;
• iii) converting said outgoing subscriber higher-rate multiplexed binary signal to multiple outgoing subscriber analog signals and converting multiple incoming subscriber analog signals to said incoming subscriber higher-rate multiplexed binary signal;
• and
• iv) transmitting said multiple outgoing subscriber analog signals to said subscriber equipment and receiving said multiple incoming subscriber analog signals from said subscriber equipment.